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"Findings from an animal study suggest that a non-invasive imaging technique could, with further development, become a useful tool to assess immune system recovery in people receiving treatment for HIV infection. Researchers used the technique to assess immune system changes throughout the bodies of macaques infected with SIV, a simian form of HIV, following initiation and interruption of antiretroviral therapy. They evaluated pools of CD4+ T cells, the main cell type that HIV infects and destroys, in tissues such as lymph nodes, spleen and gut."